The investigators anticipate to recruit 10 patients to an open pilot study. All patients will receive an active rTMS stimulation and will be given 12 treatment sessions, over a period of up to 4 weeks. Each of the 12 daily treatment sessions (lasting about 30 minutes each), will be consisted of 25 stimulation trains over the prefrontal cortex (20Hz trains, 2 seconds each with an inter-train interval of 20 seconds) and one train of 15 minutes at 1 Hz over the the motor cortex.